Cold light sources are essential microscope accessories that provide bright, even illumination without generating excessive heat, making them ideal for sensitive specimens and live cell imaging. These light sources typically utilise fibre optic technology to deliver light from a powerful lamp to the microscope stage, ensuring that samples are illuminated uniformly without risk of thermal damage. Cold light sources are available in various configurations, including adjustable intensity settings and interchangeable light guides, allowing users to tailor the illumination to specific applications. Their use is particularly beneficial in biological research, where maintaining the integrity of live samples is critical. By enhancing the clarity and quality of images, cold light sources significantly improve the overall functionality and versatility of microscopes in laboratory settings.